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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
For up-to-date information about California vascular plants, visit the Jepson eFlora.



David J. Keil, Family Editor and author, except as specified

Annual to tree
Leaves basal or cauline, alternate to whorled, simple to compound
Inflorescence: 1° inflorescence a head, each resembling a flower, 1–many, generally arrayed in cymes, generally subtended by ± calyx-like involucre; flowers 1–many per head
Flowers bisexual, unisexual, or sterile, ± small, of several types; calyx 0 or modified into pappus of bristles, scales, or awns, which is generally persistent in fruit; corolla radial or bilateral (rarely 0), lobes generally (0)4–5; stamens 4–5, anthers generally fused into cylinder around style, often appendaged at tips, bases, or both, filaments generally free, generally attached to corolla near throat; pistil 1, ovary inferior, 1-chambered, 1-seeded, style 1, branches 2, generally hair-tufted at tip, stigmas 2, generally on inside of style branches
Fruit: achene, cylindric to ovoid, generally deciduous with pappus attached
Genera in family: ± 1300 genera, 21,000 species (largest family of dicots): worldwide. Largest family in CA. Also see tribal key to CA genera: Strother 1997 Madroño 44(1):1–28. See glossary p. 25 for illustrations of general family characteristics.



Stems ± tomentose
Leaves alternate and generally clustered in axils, linear to (ob)lanceolate, sometimes persisting as stiff spines, glabrous to tomentose
Inflorescence: heads discoid, axillary or in ± rounded, terminal clusters; involucre cylindric to hemispheric; phyllaries in 1–2 ± equal series, often keeled; receptacle naked
Disk flowers generally 4–8; corollas cream to yellow, lobes long, spreading; anther bases ± sagittate, tips obtuse or acute; style branches papillate to short-bristly, tips truncate to conic
Fruit obconic or fusiform, often angled; pappus 0 or of generally many bristles or slender scales
Species in genus: 10 species: w North America
Etymology: (Greek: 4 together, from 4-flowered heads of some)
Reference: [Strother 1974 Brittonia 26:177–202]
Esp flower buds TOXIC to sheep (toxicity poorly understood).


T. axillaris A. Nelson

Plant < 15 dm, spiny
Stems evenly tomentose
Leaves: main leaves 1–5 cm, forming straight spines, tomentose, becoming glabrous; clustered leaves 2–12(20) mm, thread- to club-like, ± glabrous
Inflorescence: heads 1–3 in axils of previous year's growth; peduncles generally 4–15 mm, generally bracted; involucre 7–9 mm, obconic; phyllaries 5, ovate
Flowers 5–7; corollas 7.5–9 mm, pale yellow
Fruit generally 4–5 mm, densely long-white-hairy; pappus of ± 25 slender scales, 6–7.5 mm
Ecology: Sagebrush or saltbush scrub
Elevation: 1200–2300 m.
Bioregional distribution: s East of Sierra Nevada, Mojave Desert
Distribution outside California: to sw Utah


var. longispina (M.E. Jones) Strother

Inflorescence: peduncles and phyllaries tomentose
Fruit: hairs 9–11(14) mm
Chromosomes: 2n=60,62
Ecology: Habitats of sp.
Bioregional distribution: s East of Sierra Nevada, w Mojave Desert
Distribution outside California: to sw Utah

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bioregional map for TETRADYMIA%20axillaris%20var.%20longispina being generated
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Tetradymia axillaris var. longispina
Retrieve dichotomous key for Tetradymia
Retrieve multiple-entry key (MEKA) for Tetradymia
Overlay Consortium of California Herbaria specimen data by county on this map
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